The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 1984
Filed:
Jul. 23, 1982
Chemische Werke Huls Aktiengesellschaft, Marl, DE;
Abstract
In a process for the trimerization of diisocyanates in the presence of a catalyst comprising quaternary ammonium salts of organic acids having the formula: ##STR1## wherein X represents the same or different radicals selected from the group consisting of C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.8 cycloalkyl, and C.sub.2 -C.sub.20 aralkyl; two X radicals taken together with at least one other heteroatom forming a hetero-ring and three X radicals taken together with the quaternary nitrogen atoms forming a hetero-ring through a common hetero-atom such that said heterocyclic ring structure is selected from the group consisting of triethylene diamine, methyl triethylene diamine, quinuclidine, N-methylmorpholine, N-ethylmorpholine, and N,N'-dimethylpiperazine; R is alkyl, cycloalkyl or aralkyl, R' is R or hydrogen; R+R' together form a C.sub.1 -C.sub.12 alkyl radical; R' is hydrogen, hydroxyl or a C.sub.1 -C.sub.12 alkyl radical, optionally containing a CH.sub.(3-b) Z.sub.b group, wherein b=1 to 3 and Z is OH, the improvement comprising: reacting said diisocyanate with said catalyst in an amount of 0.02 to 0.1% by weight calculated on the weight of the compound to be trimerized at a temperature ranging from 40.degree. to 120.degree. C.